Editing Gene expression programming (section)

=====Fitness functions for Boolean problems=====
In logic there is no model structure (as defined [[#Fitness functions for classification and logistic regression|above]] for classification and logistic regression) to explore: the domain and range of logical functions comprises only 0's and 1's or false and true. So, the fitness functions available for [[Boolean algebra (logic)|Boolean algebra]] can only be based on the hits or on the confusion matrix as explained in the section [[#Fitness functions for classification and logistic regression|above]].